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• The smallest unit of an element that retains (keeps) the properties of that element.– Made up of a subatomic particles
Atom
• Small particles of the atom– Nucleus
• Protons ( + )• Neutrons (neutral charge)
– Electron Cloud• Electrons ( - )
Subatomic Particles
• Subatomic particle found orbiting in the electron cloud outside the nucleus that has a negative charge.
-
Electron
Element
• A substance composed of a single kind of atom.
– Hydrogen– Helium– Carbon– Nitrogen– Oxygen– Neon– Sodium
– Magnesium– Aluminum– Silicon– Argon– Calcium– Iron– Gold
H
He
C
N
O
Ne
Na
Mg
Al
Si
Ar
Ca
Fe
Au
• A diagram showing the arrangement of the elements according to their atomic numbers so that elements with similar properties are in the same column.
Periodic Table
Atomic Mass
Atomic #
Atomic Mass
# Protons = Atomic Number
# Neutrons = Atomic Mass- Atomic Number
# Electrons = Atomic Number